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SCIENTISTS DISCOVER AN EARTH-SIZED PLANET - UPDATES
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Topic: SCIENTISTS DISCOVER AN EARTH-SIZED PLANET - UPDATES (Read 671 times)
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Bianca
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Re: SCIENTISTS DISCOVER AN EARTH-SIZED PLANET - UPDATES
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April 21, 2009, 05:04:19 pm »
Near Neighbor
Gliese 581, a red dwarf star in the constellation Libra, lies around 20.5 light-years from Earth.
"In astronomical terms it is one of our near neighbors, the 87th closest known star system to the sun," said Carole Haswell, an astronomer at the Open University in Milton Keynes, U.K.
Since planets orbiting Gliese 581 are too far away to be seen directly, Mayor and colleagues originally spotted Gliese 581d by searching for tiny wobbles in the host star's motion using the European Southern Observatory (ESO) telescope at La Silla in Chile.
Weighing in at around seven Earth masses, Gliese 581d is unlikely to be made of rocks alone, the team believes.
"We can only speculate at this stage, but it may have a rocky core, encased in an icy layer, with a liquid ocean at the surface and an atmosphere," Mayor said.
Meanwhile, the much smaller and lighter Gliese 581e "probably doesn't look too different to Earth, except that it will be very hot, because it is so close to its host star," said Andrew Norton, an astronomer also at the Open University.
Norton's colleague Haswell added: "It is very exciting that such a promising candidate for an Earthlike planet has been found so close to us. It means there are likely to be many more when we search further."
And the more Earthlike planets there are, the greater the chance of discovering one that harbors life.
"I think it is only a matter of time," Norton said. "If life really does exist elsewhere in the universe, then within the next 10 to 15 years I expect we may see the first signs of life, via spectroscopic signals from exoplanets."
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